[1] [1] OZOUGWU O. The pathogenesis and pathophysiology of type 1 and type 2 diabetes mellitus[J]. J Physiol Pathophysiol, 2013, 4(4): 46-57.

[2] [2] ELSAYED N A, ALEPPO G, ARODA V R, et al. 2. Classification and diagnosis of diabetes:Standards of care in diabetes—2023[J]. Diabetes Care, 2023, 46(Suppl 1): S19-S40.

[3] [3] DIMEGLIO L A, EVANS-MOLINA C, ORAM R A. Type 1 diabetes[J]. Lancet, 2018, 391(10138): 2449-2462.

[4] [4] ZHENG Y, LEY S H, HU F B. Global aetiology and epidemiology of type 2 diabetes mellitus and its complications[J]. Nat Rev Endocrinol, 2018, 14(2): 88-98.

[5] [5] MA R C W. Correction to:Epidemiology of diabetes and diabetic complications in China[J]. Diabetologia, 2018, 61(6): 1491.

[6] [6] TOMIC D, SHAW J E, MAGLIANO D J. The burden and risks of emerging complications of diabetes mellitus[J]. Nat Rev Endocrinol, 2022, 18(9): 525-539.

[7] [7] GUO L X, XIAO X H. Guideline for the management of diabetes mellitus in the elderly in China (2024 edition)[J]. Aging Med (Milton), 2024, 7(1): 5-51.

[8] [8] RAGHUVANSHI D S, CHAKOLE S, KUMAR M. Relationship between vitamins and diabetes[J]. Cureus, 2023, 15(3): e36815.

[9] [9] VALDS-RAMOS R, GUADARRAMA-LPEZ A L, MARTNEZ-CARRILLO B E, et al. Vitamins and type 2 diabetes mellitus[J]. Endocr Metab Immune Disord Drug Targets, 2015, 15(1): 54-63.

[10] [10] LI C D, FU J W, YE Y P, et al. The impact of vitamin D on the etiopathogenesis and the progression of type 1 and type 2 diabetes in children and adults[J]. Front Endocrinol (Lausanne), 2024, 15: 1360525.

[11] [11] HOLICK M F. Vitamin D deficiency[J]. N Engl J Med, 2007, 357(3): 266-281.

[12] [12] SAPONARO F, SABA A, ZUCCHI R. An update on vitamin D metabolism[J]. Int J Mol Sci, 2020, 21(18): 6573.

[13] [13] YU J, SHARMA P, GIRGIS C M, et al. Vitamin D and beta cells in type 1 diabetes: a systematic review[J]. Int J Mol Sci, 2022, 23(22): 14434.

[14] [14] SACERDOTE A, DAVE P, LOKSHIN V, et al. Type 2 diabetes mellitus, insulin resistance, and vitamin D[J]. Curr Diab Rep, 2019, 19(10): 101.

[15] [15] HYPPNEN E, LR E, REUNANEN A, et al. Intake of vitamin D and risk of type 1 diabetes: a birthcohort study[J]. Lancet, 2001, 358(9292): 1500-1503.

[16] [16] GIULIETTI A, GYSEMANS C, STOFFELS K, et al. Vitamin D deficiency in early life accelerates type 1 diabetes in non-obese diabetic mice[J]. Diabetologia, 2004, 47(3): 451-462.

[17] [17] ADORINI L. Tolerogenic dendritic cells induced by vitamin D receptor ligands enhance regulatory T cells inhibiting autoimmune diabetes[J]. Ann N Y Acad Sci, 2003, 987: 258-261.

[18] [18] MAYER-DAVIS E J, DABELEA D, CRANDELL J L, et al. Nutritional factors and preservation of C-peptide in youth with recently diagnosed type 1 diabetes: SEARCH Nutrition Ancillary Study[J]. Diabetes Care, 2013, 36(7): 1842-1850.

[19] [19] LITTORIN B, BLOM P, SCHLIN A, et al. Lower levels of plasma 25-hydroxyvitamin D among young adults at diagnosis of autoimmune type 1 diabetes compared with control subjects: results from the nationwide Diabetes Incidence Study in Sweden (DISS)[J]. Diabetologia, 2006, 49(12): 2847-2852.

[20] [20] BIERSCHENK L, ALEXANDER J, WASSERFALL C, et al. Vitamin D levels in subjects with and without type 1 diabetes residing in a solar rich environment[J]. Diabetes Care, 2009, 32(11): 1977-1979.

[21] [21] NORRIS J M, LEE H S, FREDERIKSEN B, et al. Plasma 25-hydroxyvitamin D concentration and risk of islet autoimmunity[J]. Diabetes, 2018, 67(1): 146-154.

[22] [22] WANG M Y, ZHOU T, LI X, et al. Baseline vitamin D status, sleep patterns, and the risk of incident type 2 diabetes in data from the UK biobank study[J]. Diabetes Care, 2020, 43(11): 2776-2784.

[23] [23] WANG Y, DAN L, FU T, et al. Serum 25-hydroxyvitamin D, type 2 diabetes, and liver-related outcomes: secondary data analysis of a prospective recruited cohort[J]. Hepatol Commun, 2023, 7(11): e0291.

[24] [24] DOMINGUEZ L J, VERONESE N, MARRONE E, et al. Vitamin D and risk of incident type 2 diabetes in older adults: an updated systematic review and meta-analysis[J]. Nutrients, 2024, 16(11): 1561.

[25] [25] RAFIQ S, JEPPESEN P B. Insulin resistance is inversely associated with the status of vitamin D in both diabetic and non-diabetic populations[J]. Nutrients, 2021, 13(6): 1742.

[26] [26] LEI X X, ZHOU Q, WANG Y M, et al. Serum and supplemental vitamin D levels and insulin resistance in T2DM populations: a meta-analysis and systematic review[J]. Sci Rep, 2023, 13(1): 12343.

[27] [27] TEOTIA N, SINGH A, KUNWAR S, et al. Comparison of the levels of 25(OH) vitamin D3 in women with gestational diabetes mellitus and normoglycemic pregnant women[J]. J Obstet Gynaecol Res, 2021, 47(11): 3842-3848.

[28] [28] SALAKOS E, RABEONY T, COURBEBAISSE M, et al. Relationship between vitamin D status in the first trimester of pregnancy and gestational diabetes mellitus—a nested case-control study[J]. Clin Nutr, 2021, 40(1): 79-86.

[29] [29] WAN H, WANG Y Y, ZHANG K, et al. Associations between vitamin D and microvascular complications in middle-aged and elderly diabetic patients[J]. Endocr Pract, 2019, 25(8): 809-816.

[30] [30] PITTAS A G, LAU J, HU F B, et al. The role of vitamin D and calcium in type 2 diabetes. A systematic review and meta-analysis[J]. J Clin Endocrinol Metab, 2007, 92(6): 2017-2029.

[31] [31] TALAEI A, MOHAMADI M, ADGI Z. The effect of vitamin D on insulin resistance in patients with type 2 diabetes[J]. Diabetol Metab Syndr, 2013, 5(1): 8.

[32] [32] ORDOOEI M, SHOJAODDINY-ARDEKANI A, HOSEINIPOOR S H, et al. Effect of vitamin D on HbA1c levels of children and adolescents with diabetes mellitus type 1[J]. Minerva Pediatr, 2017, 69(5): 391-395.

[33] [33] PRADHAN M, HEDAOO R, JOSEPH A, et al. Charting wellness in India: piloting the iTHRIVE's functional nutrition approach to improve glycaemic and inflammatory parameters in prediabetes and type 2 diabetes mellitus[J]. Cureus, 2024, 16(7): e63744.

[34] [34] NIROOMAND M, FOTOUHI A, IRANNEJAD N, et al. Does high-dose vitamin D supplementation impact insulin resistance and risk of development of diabetes in patients with pre-diabetes? A double-blind randomized clinical trial[J]. Diabetes Res Clin Pract, 2019, 148: 1-9.

[35] [35] PITTAS A G, DAWSON-HUGHES B, SHEEHAN P, et al. Vitamin D supplementation and prevention of type 2 diabetes[J]. N Engl J Med, 2019, 381(6): 520-530.

[36] [36] DAWSON-HUGHES B, STATEN M A, KNOWLER W C, et al. Intratrial exposure to vitamin D and new-onset diabetes among adults with prediabetes: a secondary analysis from the vitamin D and type 2 diabetes (D2d) study[J]. Diabetes Care, 2020, 43(12): 2916-2922.

[37] [37] COJIC M, KOCIC R, KLISIC A, et al. The effects of vitamin D supplementation on metabolic and oxidative stress markers in patients with type 2 diabetes: a 6-month follow up randomized controlled study[J]. Front Endocrinol (Lausanne), 2021, 12: 610893.

[38] [38] CHATTERJEE R, DAVENPORT C A, VICKERY E M, et al. Effect of intratrial mean 25(OH)D concentration on diabetes risk, by race and weight: an ancillary analysis in the D2d study[J]. Am J Clin Nutr, 2023, 118(1): 59-67.

[39] [39] BARBARAWI M, ZAYED Y, BARBARAWI O, et al. Effect of vitamin D supplementation on the incidence of diabetes mellitus[J]. J Clin Endocrinol Metab, 2020, 105(8): dgaa335.

[40] [40] OLIVEIRA I N N, MACEDO-SILVA A, COUTINHO-CRUZ L, et al. Effects of vitamin D supplementation on metabolic syndrome parameters in patients with obesity or diabetes in Brazil, Europe, and the United States: a systematic review and meta-analysis[J]. J Steroid Biochem Mol Biol, 2024, 243: 106582.

[41] [41] NEALE R E, BAXTER C, ROMERO B D, et al. The D-Health Trial: a randomised controlled trial of the effect of vitamin D on mortality[J]. Lancet Diabetes Endocrinol, 2022, 10(2): 120-128.

[43] [43] MIRHOSSEINI N, VATANPARAST H, MAZIDI M, et al. Vitamin D supplementation, glycemic control, and insulin resistance in prediabetics: a meta-analysis[J]. J Endocr Soc, 2018, 2(7): 687-709.

[44] [44] GEORGE P S, PEARSON E R, WITHAM M D. Effect of vitamin D supplementation on glycaemic control and insulin resistance: a systematic review and meta-analysis[J]. Diabet Med, 2012, 29(8): e142-e150.

[45] [45] DEMAY M B, PITTAS A G, BIKLE D D, et al. Vitamin D for the prevention of disease: an endocrine society clinical practice guideline[J]. J Clin Endocrinol Metab, 2024, 109(8): 1907-1947.

[46] [46] American Diabetes Association Professional Practice Committee. 3. Prevention or delay of diabetes and associated comorbidities: standards of care in diabetes-2025[J]. Diabetes Care, 2025, 48(Supplement_1): S50-S58.